A revision of available results for picropharmacolite points out strict crystallochemical similarities with guerinite, Ca5(HAsO4)2(AsO4)2·9H2O, and supports the formula Ca4MgH2-(AsO4)4·11H2O with, possibly, a limited substitution involving H, Ca, and Mg.

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First page of On the crystal chemistry of picropharmacolite
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